.simple-button {
  position: absolute;
  bottom: 30px;
  left: 30px;
  z-index: 99999;
  width: 50px;
  height: 50px;
  color: #fff;
  font-size: 16px;
  line-height: 50px;
  text-align: center;
  background-color: #40b6ff;
  border: 1px solid #fff;
  border-radius: 100px;
  cursor: pointer;
  opacity: 0.6;
  transition: all ease 0.3s;
}
.simple-button:hover {
  opacity: 1;
}
